Hours after the early morning stabbing, the steps outside of the Putnam Avenue building were still streaked with blood. Just before 8 p.m., workers in blue hazardous-materials suits arrived to take photos and clean the porch.

Andy Constantine, 24, who lives across the street, said he woke to the sounds of yelling early Sunday. “I heard some shouting around 5 o’clock in the morning,” he said.

Constantine said he thought people might have been outside drinking and went back to sleep. He awoke again soon after, but this time to the sound of sirens.

He did not know anyone in the apartment building across the street, he said, calling the neighborhood generally safe.

The investigation into Robinson’s death was ongoing, but the district attorney’s office said the incident did not appear to be random. An autopsy was scheduled to determine the exact cause and manner of Robinson’s death.

Gomez is scheduled to be arraigned Monday in Cambridge District Court on charges of assault and battery with a dangerous weapon, assault and battery with a dangerous weapon causing serious bodily injury, and armed assault with intent to murder.